A study of a GLP-1 and GIP medicine, tirzepatide.

Recruiting now. Registry record last updated July 22, 2026.

Who can join: Adults 18+, women only.
What you take: Tirzepatide, given as part of the study. Check ClinicalTrials.gov for this trial's study groups, including any placebo or comparison medicine.
How long it lasts: The full study runs about 2 years.
What you get: Costs vary by study. Ask the study team what this one covers, including the study medicine, visits and travel, before you sign the consent form.

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Phase Not ApplicableSponsor University of Colorado, DenverDrug tirzepatideClass GLP-1/GIPSites 1 USEnrollment target 18

What this study is for

Primary condition: Lactation. Also studied in: Weight Loss.

Full scientific study title: Effects of GLP-1 RAs on Human Lactation Outcomes.

Who can join

Age18 and upSexFemale

Adults 18+, women only. A site coordinator confirms whether you qualify during a free screening visit. The exact medical requirements are below.

Full medical eligibility (for you and your doctor)verbatim from the registry

This is the exact wording from ClinicalTrials.gov, including clinical measures (lab values, imaging scores). Bring it to your doctor if any of it is unclear.

Key inclusion criteria

Breastfeeding mothers of single or multiple infants.
Milk removal at least 4x daily
Eligible for a GLP-1 RA administered subcutaneously (oral GLP-1 RAs contain absorption enhancers, which may drive accumulation in milk)
Access to a breastpump, if needed for maintaining breastfeeding behaviors.
Willingness to provide 1-3 oz of breastmilk per study visit.

Key exclusion criteria

Currently taking GLP-1 RA medication or other weight loss medication
Induced lactation, due to unknowns regarding the durability of the mammary gland's milk production after exogenous stimulation.

Where this trial is enrolling

This trial has 1 sites across 1 state. Contact a site coordinator directly to start screening.

Colorado1 site

University of Colorado Anschutz School of Medicine
Aurora, Colorado

Follow this trial

We email you if NCT07720414 changes status, adds new sites in your state, or if a similar trial opens for the same condition.

Timeline

Started enrolling: July 2026. Expected completion: June 2028. Last updated on ClinicalTrials.gov: July 22, 2026.

Official source

Every Monday we check this trial against ClinicalTrials.gov, the federal registry for clinical research. Last checked September 4, 2026. Confirm the current status there before you contact a site:

View on ClinicalTrials.gov →

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John Samaras, Founder and EditorI started GLP Chart after overpaying for a GLP-1 myself. Based in Austin, Texas.
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